No more songs to compose?

Considering the amount of music has been composed since music was written down, will there ever come a time when all combinations of notes has been exhausted and no new tunes or songs can be composed because all possible combinations have been done?

With the number of plagiarism cases made for what sounds to me to be different tunes, I do wonder if it doesn't indicate there have only been so many combinations and tunes haven't been being rehashed, even if not consciously, and modified for years.